Precise equilibrium structure determination of thiophene ( c-C ₄H ₄S) by rotational spectroscopy—Structure of a five-membered heterocycle containing a third-row atom

[1 ]Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue, Madison, Wisconsin 53706-1322, USA

[2 ]Department of Physics, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan

[3 ]Quantum Theory Project, Departments of Physics and Chemistry, University of Florida, Gainesville, Florida 32611, USA